
\begin{table}[!htp]
\begin{center}
\begin{threeparttable}
\caption{Backup energy, inrush current and capacitor characteristics for different nvSRAM capacity} \label{capacitor}
\Fsize{7}
\renewcommand{\multirowsetup}{\centering}
    \begin{tabular}{m{10mm}Im{10mm}Im{10mm}Im{11mm}|m{11mm}|m{11mm}}
    \Xhline{1.1pt}
    \multirow{2}[2]{10mm} {Capacity (KB)} & \multirow{2}[2]{12mm}{Backup Energy(nJ)} & \multirow{2}[2]{12mm}{Inrush Current(A)} &
    \multicolumn{3}{c}{Energy storage capacitor}  \\
    \cline{4-6}
    & & & C(nF)& Area overhead(\%)& Charging time(ms)\\
    \Xhline{1.1pt}


    %\multirow{2}[2]{*}{$4$}&
    1 & 30 & 0.20 & 13.0 & 0.4 & 67 \\
    \hline

    %\multirow{2}[2]{*}{$4$}&
    2 & 37 & 0.41 & 16.0 & 22.2 & 82 \\
    \hline

    4 & 51 & 0.82 & 22.1 & 64.0 & 113 \\
    \hline
    8 & 79 & 1.64 & 34.3 & 141.3 & 176 \\
    \hline
    16 & 136 & 3.28 & 58.5 & 274.6 & 300 \\
    \hline
    32 & 249 & 6.55 & 107.1 & 479.2 & 549 \\
    \hline
    64 & 474 & 13.11 & 204.3 & 743.1 & 1047 \\
    \hline

    \Xhline{1.1pt}
    \end{tabular}
\end{threeparttable}
\end{center}
\end{table}
